Machine for manufacturing abrading-disks.



1. A. HICKEY. MACHINE FOR MANUFACTURING ABRADING DISKS.

APPLICATION FILED- AUG.26.1916- 1,-291,513. Patented Ja1i.14,1 919.

13 l 18 f a I z) UNITED STATES PATENT OFFICE.

JOSEPH A. HIOKEY, or PHILADELPHIA, PENNSYLVANIA, ASSIGNOR or o n-HALr To.

FRANCIS BAN CROFT, 0F MERCHANTVILLE,

NEW JERSEY.

MACHINE FOR MANUFACTURING ABRADING-DISKS.

Specification of Letters Patent.

Patented Jan. 14., 1919..

Application filed August 26, 1916. Serial No. 116,975. e

To all whom it may concern:

Be it known that I, JosEPH A. HICKEY, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Machines for Manufacturing Abrading-Disks, of which the following is a specification.

One of the objects of my invention is to provide a machine for the manufacture of disks, such as abrading disks, blocks, etc., from or out of plastic material in which said material is applied successively in relatively thin layers. In other words, only a small portion of material is added to the disk or similar article at one time during its manufacture.

A further object of my invention is to provide an apparatus by means of which disks of relatively great and uniform density may be produce v A still further object of my invention is to provide a machine which'is simple in construction and which may be manufactured at relatively small cost and which at the same time is extremely practical and efiicient in operation. 5

Other objects and advantages of my in vention will be pointed out in the detailed description thereof which follows or will be apparent from such description.

In the drawings Figurel is a view in side elevation of a machine embodying my invention; i

Fig. 2 is a transverse, horizontal sectional view taken on the line 22 of Fig. 1

Fig. 3 is a longitudinal sectional view of a portion of the machine shown in Fi 1;

- Fig. 4 is a similar view showing a slightly modified construction ofmy invention;

Fig. ,5 is atransverse sectionalview of a portion of apparatus embodying my. inven tion" and showing a. modification of the con struction; and a Fig. 6 is a sectional plan view of a part of the machine showing a modification of the construction.

Referring to the drawings, 1 designates thefloor'or foundation upon which the side posts orystandards 2' of the machine are supported. 3 designates a mold, cylindrical-in the construction shown, provided with brackets 4: which terminate in sleeves '5 through which the side supporting posts or standards 2 extend. The said sleeves are secured in fixed positions upon the posts 2- by means of binding screws 6. 10 designates a revoluble shaft which extends upwardly through a bearing 11 formed at the center of the cross-piece 12 provided at its opposite ends with sleeve-like portions 13 through which the side supporting posts or standards 2 extend. The member 12 may be adjusted to different positions upon the said posts or; standards and secured in such positionsby means of binding screws or bolts 1 1. f 16 designates a second cross-bar-providedf with a central sleeve-like bearing 17 through which the revoluble shaft 10 extends," and also provided with bearings 18 adjacent to its opposite ends through which the supporting side posts or standards 2 extend.

2O designates a collar secured to the shaft 10 immediately underneath the bearing portion 17 of the cross-piece 16 so" that as the shaft 10 is raised, as will be hereinafter'described, the cross-piece 16 together with the parts connected therewith, will be corre spondingly raised or lifted by reason of the contact of the collar 20 with the underneath side of the bearing portion 17 of'the cross piece 16. v 21 designates portions of the cross-piece" 16 which project beyond the sleeve-like bearing portions 18-and from which weights 22 are supported by means of depending rods 23. The weights supported by each of these depending rods 23 consist of a plurality of members one or more of which may be removed so as to vary the weight supported by the projecting end portions of the crosspiece16. 3

25 designates a stationary cross-piece secured to the upper end portions of the side supports or standards 2. Said cross-piece is provided with a bearing 26 in which the upper end portion of the revoluble shaft 10 issupported and guided.-

It will be understood that the cro ss-piece 12 may be adjusted to thedesiredposition with respect to the other parts of the struc-f ture and fastened permanentlyin such-post tion upon the side supports or'standards2. The shaft 10 is'provided withwheel 27 to which power is applied bymeans of 'a" band or otherwise for driving said shaft.

Secured to the lower end of the revoluble shaft 10 is a device for forming the disk in the mold, the said device comprising a 'plu'= rality of arms 30 (four in thecon'struction be removed .andthe disk which. has been shown, although the number may be increased or diminished as maybe desired) which extend radially outwardly. The edges of these arms may be slightly rounded off as indicated at' 32 in'Fig. 3 or the undercutting or beveling may be greatly increased as indicatedat 33 in Fig. 4. I also prefer to construct the upper sides of the said arms with a sloping-or inclined surface, such as is shown at .34 in Fig. 3, or such as is shown at 35 in Fig. 4. In the former case the lower edge of the inclined surface terminates in line with'the lower surface of the arms 30 whereas in the latter the inclined surface 35 terminates at 36 a considerable distance above the lower-side arms.

Centrallyof its lower end the revoluble shaft 10 is provided witha short cylindrical projection around which the plastic material 4:118. packed, as shown in'Fig. 3, to form the centralf opening '42 through the disk toprovide means for attaching the disk to its holder'or support in practical operation."

In order to insure that the plastic material shall bs-packed firmly around the projection 40 I prefer that the inner ends of the'beveled or inclined portions 32 'or 33 shall terminate ini'inwardly inclined 'sur-.

faces as indicated at 43 in the drawings.

It is found,"however, that such inclined surfaces are not actually necessary although it is preferred that they shall be present.

InFig'. 5 I have shown a'construction in which both edges ofthe arms are undercut as shown at 33-and 45 and in which also the upper side of the arm is wedge-shaped,

that isto say, terminates in an acute'ar'igle asshown at 46.

- The bottom'of the mold is closed by means of a-Temovable: plate vor disk 'supported upon ahead "51-upo'n the upper end of a plunger 52 operated in'any suitable manner, as byv me'ansof a'hydraulic press. By dropping'the head 51, the bottom 50 may formed .in the'mold also removed.

.. iIIiI theseveral constructionsx'shown.it is a'ssume'd that the shaft. 10 rotates in "a clockw e rectiony OnS lucting the operative edges of the arms 3. .inthe manner shown in Fig. GinQWhich the inner andouter end portions are. angularly. related withrespect-to each 01 1 61? -the tendenoy is to causerthe plastic material to be compressed more uniformly from the center to the outer edges thereof,

which, of course, is a very"desirable feature as the more uniformly at all points the material of the disks is compacted the more satisfactory will the operation of the said disks be.

If it should be desired to manufacture different sized disks, that is to say, disks of different diameters, this may be accomplished merely by inserting into the mold 3 a sleeve, such as 60. The thickness of these sleeves may. be varied so that a single apparatus may be employed for manufacturing disks of a considerable number of different diameters. It would also benecessary'to change the arms upon shaft 10 so as tohave them of a length to fitsnugly inside of the mold, as is shown in the several figures of the drawing."

In the employment of my apparatus in the manufacture of abradingdisks or similar articles, the bottom 50 is placed in posi tion as shown in Figs. 3 and '4 of the drawings with the shaft 10 insuch position'that the arms 30 are situated near the said bottom. The plastic material is then poured into a mold upon the top ofthe arms. As the arms rotate in'the' direction already indicated the rounded or undercut forward operative edges thereof causesmall portionsof the plastic material to be spreadout and compacted first directly against the bottom 50 and thereafter in successive thinv layers one upon the other until the disk is of'the thickness desired. As theflthickness'ofi the disk increases the shaft 10 is lifted carry ing with it the driving wheel 27,:the crosspiece 16, and the weights 22 isuppo'rted' thereon. The force exerted by the' parts thus lifted acts to compress and thoroughly compact the plastic material as the disk is formed. Such force maybe increased-or diminished by increasingor diminishing the weight of the weights 22.-

It shouldbe understood that the abrad angle of the rounded Toff or undercut fportlon thethicknessof thellayers of plastic material applied in .the construction :of the the lower end of the By varying and increasing the amount/and abrading disk may be varied. In 'cons'e-" ueries the density or compactness of the disk may be varied' and controlled; "When the disk is built up by the successive-application of their layers itis more condensed and more uniformly compacted than if it is built up by the application of thicker layers successively.

In actual practice it would be convenient and desirable to have on hand a number of disk forming devices having different rounded off or undercut portions at their operative edges so that one device may be substituted for another as may be deslred.

I claim 1. In a machine of the character described, the combination of a mold having a bottom, a revoluble shaft, one or more arms secured to and extending radially from the lower end of said shaft and rotating therewith, the outer end portion or portions of the forward or operative side or sides of said arm or arms being angularly related to the inner portion or portions thereof, the said outer end portion or portions being bent or extended in the direction of the rotation thereof and the lower forward or operative edge or edges of the said arm or arms being rounded ofi or beveled and means for causing revolution of the said shaft.

2. In a machine of the character described, the combination of a mold having a bottom, a revoluble shaft, means for causing rotation of said shaft, one or more arms secured to and extending radially from the lower end of said shaft and rotating therewith, the forward lower operative edge or edges of the said arm or arms being rounded off or beveled and the outer end portion or portions of the said arm or arms being bent and extended in the direction of rotation thereof at an angle to the inner remaining portion or portions of said arm or arms, and means tending to cause relative movement between the said mold and the said shaft in the direction of the axis of the latter.

In testimony that I claim the foregoing as my invention, I have'hereunto signed my name this th day of August, A. D. 1916.

JOSEPH A. HICKEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 0." 

